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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1758c733c7aeb6f42f2010b28718e4350f7a1cebb7a4c4e0a060785f40ccee6a' 
  AND token = 'WG6rEauY4IIE8not6KWT7oclQ3CJ8FvNmXalZfI3rJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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