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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '468b1ce753d57267e38ebef317b319f69a184f5cbf5768f692248c1ae324b89e' 
  AND token = 'T5K7x9n41OI1N5p2h3Hn0onkfO8lSmc2H3X5Qm5uveU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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