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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '076dcaf4032593ef967c33312338b1fc0131ed57527834f41652f2a0e2c935ab' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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