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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b398a33e2b7b1c9cfb94efa41b76df2e91ee23245c83118bc375f4f30540b2d' 
  AND token = '08veew9QMV0f3WgqnL/A97UKLgDTPDb+4z6Q4vgSMmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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