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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c568b26bbffcce4868e070cd27cf1a4cbba6d20cdad86721e34583ac76f20d8' 
  AND token = '9kCnw+x9855j5ruzKqUBinP9u+/miz59uIgBDSORS5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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