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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '704821f13ff1fa171650bc5214cc624a5053bb757aa1bdbc1943180731e70aea' 
  AND token = 'fZ7dl3dPBIpYZin6jtGU1Ra+shuR5OQuglmU6LgwTv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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