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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36db3274735090336399fdadfdaf684abc661a6ed547e2fd18013be2b9c27b9f' 
  AND token = 'YxJMeS6GZt+SrzZQo9jMXIZpEhD2HM1AaCoqJLIRj2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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