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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f8b6f03e4c64cb0e48b0755fb11346986e60c795911cee6ecc07aecddb6620f' 
  AND token = 'Rto1I00KRV49W8U5WSS8R707t7b269NwOYOTi4Lf05g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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