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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca3cb04d4d143897f0c5433795ee7296c376c892baa327b4cb069777229e4329' 
  AND token = 'tItoR7Q8XE9/G03TvlLkVimmRPBU9y4gidkDrUKVQDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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