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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d564c38781cb8052c536c4b73e0bb6ba9d2b276772b028d3acd5938bc9dd91c' 
  AND token = 'yoUIX6Gk5H7/HbIblKcNYpc8yluuPtClqhbECGYQ3G0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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