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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ea99c72408876242c5ee2ac3d4ac982776e4c098b7b69127e0cf4f282e8a98f' 
  AND token = 'SbGfWZaZyaT+6sNRp+lyWvv6Chp0D3JuQ6yQhoGusqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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