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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee9b6f877f9f9441b2699d8a5e370382cbd4eb6e012c9b53c86feb08cdb3297f' 
  AND token = 'q+WmbMD1pTeMKX/Gxg4kpvG+vxGanV7W4MfXleALR/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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