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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3b6028813224400ed7781c2207d09fb9ca41d28635ed8b449c57bc5c2b1006d' 
  AND token = 'iaFu0PWvt4tUx3jmhvgfSz2TXmIdUIQPgW3AbhfJtRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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