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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2890bdaa79ec1695665d9df93401991a525bc6d35d8154728721350f3c99c0e2' 
  AND token = '6MP7PiZBaMcX2BUN6pYhcL3IB1YP/4qzlfNetA9YZjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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