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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62de84e5072f3e89e4be552d506c51de6aecdd115eea223dfa7993a37fbc02a1' 
  AND token = 'K3keK1PujLrvnkmY4iZzgcL2WUp5+32x7A3X2xwuJCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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