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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc8d8d0a58752ce27c3b16e3b39a0c0d64f5fe20d96c8d5f4d2ba48e542c4a9e' 
  AND token = 'cKY4QqyOeEAIXShyRfV2/JCD7RyfzhcEF8HD8i5aYaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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