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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e332b48d42b267c9845f7583bdb22618ada3b58538034466f43bceb44f7f74c' 
  AND token = '3S3Sdn0z7qlIvquALQgxEqw7XuCNMJnNM4mHay+a6SI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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