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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb38750b1e148143bc5e20bab47a679e59924ea3e0ecd34f70b76efbddf274a9' 
  AND token = 'w5NcdKv9Ist1QXjpjL5ftFWxUQ89cAdnn/VbkYaCVQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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