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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f8c38390ccad241bb5dc3cb1a36b64df2c71db1736ef112cac372f82e65729d' 
  AND token = 'EIgxxl6mWy1hHtVXSU4Dtd890U8JblXRfqD22/+mQKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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