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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '136198bea71c3799cb4110eeaefa1d251f7b848e047aa6c56521110359751592' 
  AND token = 'b0tP96fKIyf7sl3og1XXw7F2DIbXCRVq31XqURIKuzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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