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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8abd4acc5dcbeb980d8e131bfb985f2502473df20b61178aa0467438e82cfad5' 
  AND token = 'A5of9IPa7VBBNXe3wqkiAk1JdEbn61CdTIFgu4Vy+5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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