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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a82efb118400ff93f84e0e4c79984598ecd2ae59445732076c0c641f172dc37f' 
  AND token = '0S7Kzn8qjDYjlsPc4LAEzU4BOLWYd6j9Zqs90YGxrg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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