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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bc4559c805802c0e041987b039c6953df076150c5aa4acbc759092daa0ce220' 
  AND token = 'f6bgjRsayC1K95RuPBmj3y3D/e6o9MoY+55BIED1umg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}