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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bcd0ad5ff45e8fd8af4f76605127dafa87a25ca34a5ea8f53e14d00420b1e0b' 
  AND token = 'BucLTuY3hJptVcn1YU1ksSQcYa15wVQL3VgycNGSv8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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