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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cad626413a6ea890f90feaab11c28e8d36fb11ed3c1c05760d789bf30c949ee' 
  AND token = 'xRMStnRsrwb0pSb4JVtgP3az4cqKz/0Gg8ldzvxW2zM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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