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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4467c3ee29998588ab33b30fb8559e522462a05fa74e76a7eb12b1e87b61c257' 
  AND token = '2Dgvaglcf38rR1dGfbo+N+SlpjHkffr8qS1q5BBsMfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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