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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2433e20c61c3c1a6a5739b2802ce90bbcb2879c9d5dd189a1d74052ea51ca30' 
  AND token = '9VDDD25UkViIPHaC0CIZbpLDQiY54fdL4/FfV/j9W40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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