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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e5c76ec98fc18087668038d2ed38ccf8a9f60c72d87a9f1c8e6894a5b71e565' 
  AND token = 'djsz6vMB35Av/I9Gi2+dzfouaCav/B5T4BNMFtbLJj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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