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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '910b853f37641610d87f1d6e0101c1890f4264dd4e63d93271a307831b7988c7' 
  AND token = 'bbX5fnphoMLNMCgNn817aWos2mbOktQ2XKC5JwjBQSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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