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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63e9ac58c28f5123d39b2157637dbb5a9f47b7b8bab82f8613b88029d2e9b8bf' 
  AND token = 'cTvSEr9DK67HivCv8ZCNTN4H3snGYb+6DbwIsjCi5Ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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