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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cd462d70b90c5b803b7c60dadb3143de2666f8475db9420ae1d26a875547b39' 
  AND token = 'nJcGWTLjDEzfN3d6ecGxL16Lvf9RmnkSIK5nnXQVOHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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