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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e6797d422f7261fb89b8d007090c330593236470e14b2e06124b2f70151cd52' 
  AND token = 'C/E816i66oSMdPpk5hI055v6sVGyDxwQpOhHLQ1o2e0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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