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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10b6fe521c5fc480ce0d357f30694e52a11fc93c34e0e5e01f7f5470569f2bbd' 
  AND token = '13pefQAskJs5OaitpsD/gQJ8E6xj6bkxVrbFWoqrxNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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