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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07a8aadcaddb53e830e9c7cffabdb0c48e014ea237663dd2b0c54bc021c665c9' 
  AND token = 'xGloMH2nLawRxOPXn/Tvh009MIHzKBc71yEe00KafkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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