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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b075ed056a72662f82da255d1cc5872744a762a3d7e5ad24f8de9c9dd0e259e' 
  AND token = 'tTbRWWc0UngSk0pFtZSEhpAJlXbdfj7H/2Rb34OMzCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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