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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7d54a2a042acc32fd2d8f10bcffc8998e8842b72a2cf77236bfca5aee8e1096' 
  AND token = 'NiYuW3Q0NHd+e9BSPzcJdZfnpM/6fje5PpV1sV296NY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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