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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59605d56879ad1561c9ccfd79a94e2573095c4cb9cef56b95918498099533da2' 
  AND token = 'rfwOy186AaRiIB5+1oYbIymvJg+0rlVVTBvuzuKq5S4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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