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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa29c295067efeb6b867da00bb8312a2f5cd1c8de467d8fb3e38c78798af27a4' 
  AND token = 'G/uglSilNd7Lf76+Auesekkc++OCmeY9E3KresGp7lM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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