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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a582676b3df7f753db0b568f528a66f3c910f1a0afa7597a3e191e6c176b605e' 
  AND token = 'YwvNqS9ui51bJqt9+yDQm2KYtEy+E5/veOc7E4SYg3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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