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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8dcdf8906fd24fde5aa923ae46fd2f91c6787402d386232d400ddff44271b09' 
  AND token = 'L68iSnvp/KEDk9ojqXjg9QvNoplZdYWZnH2l26mFY9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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