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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab2d285e30c57b0b48f34d6e3bca64fe92097063a66448e7b6f624c9cbccd977' 
  AND token = '0ILc2A5DNbnSIXtLiVmDzk9PjR6swcWUBSRSgr62d7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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