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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b83a89a3a7131cdf48b0e4e1478b89644be982d2be0be5b8e73d906316e4c87' 
  AND token = 'LRIANos2e1enFnwLBJ4WTjmHuDDs2U8M93wSNL/GG0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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