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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6352ce71e8048004cd5a7c6659f436c8750798241fcab65708fd3fbddaa6d942' 
  AND token = 'bG83SOoVDggp9qOo26qpF2r71tV/IWTHS07tSZvn3T8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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