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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcaefef90c8985e7b83539ab83870a0cb6d01b5ed0aefdf033a6af5d2755576e' 
  AND token = 'lWth5a3+yJqGXm6PqhlfbsTpaUIbPcHI5MXe3hHCKKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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