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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7796205cdea16359981f783157c29cf806427a2e02c77cd2608302334b1793a6' 
  AND token = 'F6ONd96ZwOR6DATH6zCmeMo1p8jDq06LR/yOkz+Ih2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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