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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1a09be48ffadded95f63a4b938f91ba62f59c9f7d9104fe884dec4d90fc0f0b' 
  AND token = 'MHXgiV+Zbbr2+XEM+C8RtiEDyt/yRFwghYqoeCFTapE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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