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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f92057a19c889ffbc987a42cac047e0b8b84a2e753476eb757d13f571f96711' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00132

JSON explain

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