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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f88b11927974caff099e60e65cabd13ecc27bc3cfee43eb5d1ce0a88b22272f' 
  AND token = 'j3xmWVtK4eMH2/mbb5IACatDjK64UavhQUP2c7ByjEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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