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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27b17af76d4b41f41fd7b7f200d9b0669e0482be816569f0266f1f116607dcef' 
  AND token = 'NDojtRoxzBZNrTEMJDCn3M4tdINnefGk6lRG8dfST24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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