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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc556fd675ed0a429f2a52881db852aad8d2a5b5525ea2e0f69f5cd13778ca83' 
  AND token = 'WBLS1alnsDT+U50oQaR/ss7p0+xuln3PiACMvwyW/2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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