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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b3c47f8a853ab7eb854e29cb00d61d7453bba4360b040d228108b8fe6c1cee6' 
  AND token = 'oIzAMkvBOA5HNCPEESsFKO5bXFp3qzInQNjzCyvTYWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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