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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9ce0f2e9463159985dd03e40180aca8c8d05afbbf68a5ba2b7e8bff95684fb4' 
  AND token = 'TetP+Jqck7HilPOHhIhVNCLoIriWL3O04l/yo3tDTPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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