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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e749b617207e4f9b1c17c115ac7335c0dd5a15aaabed8cd315eb699d500342f' 
  AND token = 'YyGid7DHafyo5PPjHcm5LTAonv7eJxeIGpWvYTLu1DM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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