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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ffed396e5c64962e107255291b56f7d7df43c29da74b6c70a539adfb60d8c94' 
  AND token = 'Gq1YCUXbqd/yzr+fHqSOI3ORwpbIvH196ft6sXqF7Vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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