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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cc5c1378788abf7a5a8b36ce7e2fb63258fd87b3607aa45fb5a7e185c511b63' 
  AND token = 'etpx5ppc0uxubLDlmM4btlgEDj/EV/uTA657qTRPLJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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