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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93ff5c53e7c681350211689a205f53a3aca34aeb45ff1d8512360aaec7f9af98' 
  AND token = 'IZJdqHeztkjZViA2SSCTbQciAi/nHc2L6BCTvZxFLTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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