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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcd0a662eccf2365f3ebe6961695ff7e426bda99ce8a0e3b0bb5e9ee25001c7f' 
  AND token = '7uq9uZwUB3M0c3JygU/FxW4rdJlyYyaq/z2J7bbE9hA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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