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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82e53a93d45fb53d32c9aeff08ef971fa6b109e4ecf7fd96df1bd0e5190ceda5' 
  AND token = 'QzUJwcT4D3BmRyMKc79KTgqjk2l2kX8FKI1d5NHAMDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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