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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f7790775676e2e426aaa108a0371af20603ce6fe8060b0aba9e65092a73baee' 
  AND token = 'bMGwWp34iG7PBGwNtvJJBB289l6L5bUB+xm9kZaIT7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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