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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22e9106b4760a88869267d6f217eda5e4cf8bd14552f63364f2da2d6d43d65d1' 
  AND token = 'fpXFc/qWZzcL8PTN+XQg4eLVzY7mypmDc39O0V1pxtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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